Discussion
Which arrangement allows an update to be rolled back?
Answer: A
The vehicle keeps running from the active bank while the new software is written and verified in the other. The last option describes exactly that process, which makes it a correct and more detailed version. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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